Sorry if I'm asking an obvious question. I have proposed a load balancing algorithm for a system of several devices. Suppose at first the number of tasks on each device is $device1 = 18$, $device2 = 8$ and $device3 = 2$. Now after load balancing the number of tasks on each device has become $device1 = 10$, $device2 = 8$ and $device3 = 10$.
I want to publish the results and say that the number of tasks on devices is moderated after load balancing. I mean at first for example one device had $18$ tasks, while another had $2$ tasks, but after load balancing this amount is almost equal between all devices and it is almost $10$ which shows that these tasks are distributed almost equally.
But how can I state this in mathematical language? I was thinking about "the mean value of tasks" before and after load balancing, but then I saw that they are the same. So is there any mathematical way to show this difference in number of tasks before and after?